rusackas commented on PR #39278:
URL: https://github.com/apache/superset/pull/39278#issuecomment-5188013028

   @dpgaspar scratch my gevent theory from June, think I found the real cause. 
It's not session scoping at all, it's a gap in Flask-AppBuilder's own FSA-3.x 
shim: `base_legacy.py` overrides `create_session()`/`get_bind()` to bind 
Superset's models onto FAB's own `declarative_base()`, but `base.py` (the FSA 
3.x version) doesn't do any of that anymore, and `SQLA(app)` never passes 
`model_class=`. So under FSA 3.x, Superset's models and `db.session`'s bind 
resolution are looking at two disconnected registries, which lines up with the 
NoneType breadth I saw reproducing this in #42542 (dashboards, security, tasks, 
all hitting the same mismatched seam).
   
   You'd know this better than I would since you wrote FAB. Does that match 
your read, and is wiring `model_class=` through when `base.py` builds 
`SQLA(app)` enough, or is there more to it?
   
   We're about to pick step 6 back up on #40273 now that the driver-compat prep 
landed in #42542, so this is converging with that work. Worth coordinating 
rather than duplicating effort.
   


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